pretty sure almost anyone would be fine with trans or transgender at worst a normal person may ask you to call them otherwise after but most trans people wouldnt be offended by it tranny on the other hand would offend a very large amount of transgender people so even if theres not a perfect word that everyone is fine with it its the difference between using a word that maybe like of trans people would object to versus one like of trans people would object to numbers are pretty random but you get the point i guess